(1-x)La 8/9 Sr 1/45 Na 4/45 MnO 3 /x（Cr 2 O 3 ）的电输运性质及室温磁电阻增

发布时间：2021-12-24 19:45

　　用固相反应法制备（1-x）La_8/9Sr_1/45Na_4/45MnO₃/x（Cr₂O₃）（x=0,0.05,0.10,0.20）系列样品。通过X射线衍射（XRD）图谱、扫描电子显微镜（SEM）照片,探究晶体结构;通过零场和加场（B=0.8 T）的电阻率-温度（ρ-T）曲线,研究电输运性质;并作出磁电阻-温度（MR-T）曲线,研究磁电阻行为。结果表明:样品是钙钛矿氧化物与Cr₂O₃二相复合体,复合样品的电输运性质与母体截然不同,在整个测试温区表现为绝缘体导电行为,因为Cr₂O₃是绝缘体,它包覆在钙钛矿颗粒表面形成厚厚的势垒层,自旋电子难以穿越;复合样品在室温附近很宽泛温区磁电阻大大增强,x=0.10的样品,在172³20 K温区MR>14.3%,x=0.20的样品,在250³20 K温区MR>15%。在室温附近如此宽泛... 

【文章来源】：稀有金属. 2017,41(06)北大核心EICSCD

【文章页数】：6 页

【文章目录】：
1实验
2结果与讨论
    2.1结构
    2.2电输运性质
    2.3磁电阻效应
3结语


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